A lightweight library for Object Oriented programming (OOP) in Haskell.

The library is inspired by the "Mutable Objects, with tail-polymorphism" approach as described in the "Haskell's overlooked object system" paper and extends it with:

• Generic up and downcasts using dynamic typing
• An inheritance combinator, from A Denotational Semantics of Inheritance and its Correctness
• Parameterized classes
• CPP macros for deriving parts of the boilerplate

It was created as part of my master thesis "wxHaskell for the web, 2012" where it served as a tool to facilitate the implementation of an object-oriented GUI toolkit in Haskell.

Please look inside the src/Examples directory for additional examples.

make ghci 

or

make ghci MAIN=src/Examples/{One of the examples}

Make sure the UHC environment variable points to your local UHC installation.

make 

or

make MAIN=src/Examples/{One of the examples}

• OOP in Haskell
• Codata in Action
• Nixpkgs overlays are monoids